+ the window pointer is null. If an error is returned by the <STRONG>wmove</STRONG>, no
+ characters are added to the window.
+
+ If an error is returned by <STRONG>waddch</STRONG> (e.g., because the window is not
+ large enough, or an illegal byte sequence was detected) only part of
+ the string may be added. Aside from that, there is a special case in
+ <STRONG>waddch</STRONG> where an error may be returned after successfully writing a
+ character to the lower-right corner of a window when <STRONG>scrollok</STRONG> is dis-
+ abled.